Hooray! Congrats on a working SE/30!
And thank you for detailing your steps here - they're now available for everyone ever needing a sanity check for their own SE/30 issues.
This looks SO good. I believe I've seen bits of this project elsewhere on the 'net - Mastodon maybe?
At any rate and impressive mod and a perfect use for a non-working Portable shell.
That card plugs into the PDS slot on the Macintosh SE.
Correct - the SE, and not the SE/30. They look similar, but the cards aren't compatible.
Installation is illustrated here: https://archive.org/details/asante-maccon/page/n31/mode/2up
Just wanted to leave a note saying this is exactly the sort of project I love. Recreating a dear memory. My first computer experience was on a 512k, later an SE with a Jasmine 40MB external drive. I know the craving to recreate exactly that environment.